Temperature indicator



L. V. ARONSON. TEMPERATURE INDICATOR. APPLICATION FILED 001 14. 1920.

Patented July 18, 1922.

-LOUIS V. ARONSON, OF NEWARK, NEW JERSEY.

TEMPERATURE INDICATOR.

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Specification of Letters Patent.

Patented July 18, 1922.

Application filed October 14, 1920. Serial No. 416,907.

To all whom it may concern:

Be it known that I, LoUIs V. ARoNsoN, a citizen of the United States, residing at Newark, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in Temperature Indicators, of which the following is a specification.

This invention relates to temperature indicators and more particularly to that class of such devices adapted for use with the cooling systems of internal combustion engines, to indicate abnormal conditions of the cooling medium employed therein.

The primary object of the present invention is to provide a device of the character set forth with improved means for containing the temperature responsive element, other means being associated with such container whereby to increase the surface af fected by temperature changes, thus giving the device a greater efficiency in operation.

, A further object of this invention is to so construct that portion of the responsive element container which extends into the radiator to provide fiexibilityand strength thereto, means being further provided whereby the container is formed as a unit, readily removable from the remainder of the device.

With the foregoing and other objects in view, as will from time to time hereinafter appear, this'invention consists in the pe-.

culiar combination and arrangement of the various parts of a temperature indicator, as described in the following specification and more particularly set forth in the appended claim.

Referring to the accompanying drawings illustrating an embodiment of the invention, and in which like reference numerals indicate the same parts throughout,

Figure 1 is a front elevation showing, in dotted lines, the flexible container in various positions, and I Fig. 2 is a perspective view, partly broken away, of the container unit, before assem- 3 designates the frame of the device having a base 4 which is adapted to rest upon the radiator cap of an automobile in the usual manner. Threaded into the base 4 at 5 is a tube 6 exteriorly threaded and removably held within the base 4 by means of tube 13 projects.

nut 7 and the threaded washers 8, 9 and 10, the base 4 bein recessed, as at 11, for the reception of S110 securing means.

At a oint above the threaded engagement 5 tie tube 6 is left unthreaded exteriorly as at 12.

A second tube 18, of soft metal, and having a relatively thick wall 14 and a central bore 15, extends from. the tube 6,as shown and forms a linin for the tube 6. At 16 this soft metal linm is threaded to receive the end 17 of the in icating tube 18 formed of glass. In assembling the device, the joint formed between the threads 16 and the member 17, is cemented to form a tight joint and obviate breakage of the indicator 5 tube 18.

' After the tube 13 and the indicator 18 have been assembled as above described, they are filled with a temperature responsive element and the end of tube 18 capped off in any suitable manner confining theresponsive element.

A coiled spring 20 formed of copper wire encloses the projecting portion of the tube 13,being fastened to tube 6 at 21 and terminating in a closely coiled head 22 also secured to {the tube 13, the coils intermediate the ends of the member 20 being free from, but contacting with the tube 13.

By the construction above described the tube 13, when the device is placed in position upon the radiator cap, may be bent to any suitable position to conform to the interior dimensions and configuration of the space in the radiator into which the said By forming the coil 20 from copper wire encircling the tube 13 there is provided a large amount of additional surface .to be acted upon by the temperature of the water into which the tube, together with its coil, projects, Due to this construction changes intemperature of the cooling medium within the radiator are readily transmitted to the tube 13 and to the tem erature responsive element contained t erein up to the boiling point, at which time the temperature responsive element as for instance a solution of cobalt nitrate contained within the tube 13 is adapted to change color, thus indicating dangerous conditions of the cooling system. Upon an approach to normal conditions of temperature by the cooling medium by reduction in temperature the temperature responsive element within the tube 13 again changes to normal, the coil 20 assisting in dissipating the heat contained within the Wall of the tube 13 thus facilitatin the operation of the device.

he head 22 of the coil 20 forms an effective guard for the end of the tube 13, guarding the same against breakage by repeated dium through the indicating device is enhanced, and the dissipation of such heat so eas es increased upon the return of the cooling medium to normal conditions.

What I claim and desireto secure by Letters Patent is In a device for indicating the temperature of the cooling medium of an internal combustion engine, a flexible tube adapted to extendinto said cooling medium, indicating means carried by said flexible tube, a temperature responsive element contained in said tube, a flexible thermal element wound spirally upon said tube, the turns of the spirals adjacent the end of the tube being closely wound whereby to protect the end of the tube.

In testimony whereof I aflix my signature.

LOUIS V. ARONSON, 

